Short answers, pulled from the story.
The Hawaiian Islands formed when magma from the Earth's mantle rose to create volcanoes that broke the ocean surface. Over millions of years, tectonic plate movement carried these islands away from the heat source, causing erosion and replacement by new volcanic peaks. The oldest island in the chain is approximately 25 million years old, while the island of Hawaii remains an active volcano today.
Charles Darwin observed fifteen distinct species of tanager birds on the Galápagos Islands during his voyage on the HMS Beagle in 1835. He noted that each species had a beak shaped to crack specific seeds, eat cactus pulp, or hunt spiders. His study of these creatures led to the publication of On the Origin of Species over twenty years later.
Polynesian navigators sailed east from New Guinea and the Solomon Islands to reach Fiji and Samoa between 1100 and 800 BC. They eventually pushed as far as Easter Island and New Zealand without the aid of modern instruments. These explorers traveled distances of up to 2,000 kilometers to settle new lands using knowledge of seabirds, cloud patterns, and wave direction.
The island rule states that small mammals such as rodents tend to evolve into larger animals known as island gigantism because they face fewer predators. Conversely, larger animals like hippos tend to become smaller known as insular dwarfism because they exhaust food resources quickly. The extinct Dodo serves as an example of island gigantism, while the pygmy hippopotamus illustrates insular dwarfism.
Pohnpei was colonized by Spain as early as 1526 during the 16th century when European states placed most of Oceania under colonial administration. Guam remained a Spanish territory until 1898. The legacy of colonization left deep scars including the forced displacement of people from their home islands due to nuclear weapons testing on the Marshall Islands.
The Marshall Islands and Tuvalu are identified as countries that may be existentially threatened by rising seas. Tuvalu signed a cooperation agreement with Australia to allow 280 of its citizens to become permanent residents annually. In 2017, Hurricane Maria caused a loss of almost all the infrastructure in Dominica, while sea level rise reduces freshwater reserves and causes droughts.